Optimum compression ratio on ground grid design in MEA´s power distribution substation

The study provides comparison of grounding performance between square and rectangle ground grid, when given the same size of area of coverage. The result shows that the rectangle ground grid possesses better grounding performance than the square one. The study also finds the optimum compression ratio (OCR) of both grounding configuration. The OCR of square and rectangle ground grids are found to be 0.3 and 0.4 respectively. Modeling and simulation is carried out on the Current Distribution Electromagnetic interference Grounding and Soil structure (CDEGS) program. The simulation results support the fact that unequal span ground grid is more superior to the equal span type. The finding could be used as a guide line in grounding grid design.